P2405
EVAP System Leak Detection Pump Sense Circuit Low
Evaporative emissions (EVAP)
Generic OBD-II
Low
What it means
P2405 means the ECM has detected low voltage on the sense circuit of the EVAP leak detection pump — the pump that pressurizes the fuel-vapor system to check for leaks. It is an emissions-monitor fault, so the car drives normally, but the EVAP self-test cannot complete until the circuit is repaired.
Low
Can I keep driving? Safe to drive — this is an emissions monitor fault with no effect on how the car runs, though it will need fixing to pass an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- No change in how the vehicle drives
- EVAP monitor will not complete
- May fail an emissions test
Common causes
Most likely first
- Faulty EVAP leak detection pump (LDP) sense circuitLikely
- Open or short to ground in the sense wiringCommon
- Corroded or loose LDP connectorCommon
- Failed leak detection pumpLess often
- Poor ground or reference voltage to the pumpLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm no other EVAP codes are present.
- Inspect the leak detection pump connector and wiring for damage or corrosion.
- Check the sense circuit for an open or short to ground against spec.
- Verify the pump's power, ground, and reference voltage.
- Replace the leak detection pump if the circuit checks good but the signal is low, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2405?+
Yes. It affects only the evaporative-emissions self-test, not drivability, but fix it so the car can pass emissions.
Can I just clear P2405?+
It will return the next time the EVAP monitor runs unless the pump or its wiring is repaired.
Related codes
Often seen with P2405
Read & clear P2405 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX